# # settings/router.py
# # database router to multiple database by app label
# class DatabaseRouter:
#     route_app_labels = {'wangzhe'}  # app的名字
#
#     def db_for_read(self, model, **hints):
#         if model._meta.app_label in self.route_app_labels:
#             return 'business'  # 数据库的名字
#         return 'default'
#
#     def db_for_write(self, model, **hints):
#         if model._meta.app_label in self.route_app_labels:
#             return 'business'
#         return 'default'
#
#     def allow_relation(self, obj1, obj2, **hints):
#         return None
#
#     def allow_migrate(self, db, app_label, model_name=None, **hints):
#         """
#         遗留数据库中的表不允许迁移
#         """
#         if app_label in self.route_app_labels:
#             return False
#         return True
